What is true about ribosomes?

1. The prokaryotic ribosomes are 80 S, where S stands for sedimentation coefficient

2. These are composed of ribonucleic acid and proteins

3. These are found only in eukaryotic cells

4. These are self-splicing introns of some RNAs

 

Select the correct statement from the following regarding cell membrane.

1. Na⁺ and K ions move across cell membrane by passive transport

2. Proteins make up 60 to 70% of the cell membrane

3. Lipids are arranged in a bilayer with polar heads towards the inner part

4. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Important site for formation of glycoproteins and glycolipids is

1. Golgi apparatus

2. plastid

3. Lysosome

4. vacuole

Which one of the following also act as a ribozyme in a bacterial cell?

1. snRNA

2. hn RNA

3. 23 S rRNA

4. 5 S rRNA

In eubacteria, a cellular component that resembles eukaryotic cells is

1. nucleus

2. ribosomes

3. cell wall

4. plasma membrane

Peptide synthesis inside a cell takes place in

1. mitochondria

2. chromoplast

3. ribosomes

4. chloroplast

Which one of the following structures between two adjacent cells is an effective transport

pathway?

1. Plasmodesmata

2. Plastoquinones

3. Endoplasmic rcticulum

4. Plasmalemma

Which one of the following has its own DNA?

1. Mitochondria

2. Dictyosome

3. Lysosome

4. Peroxisome

The main arena of various types of activities of a cell is

1. plasma membrane

2. mitochondrion

3. cytoplasm

4. nucleus

The plasma membrane consists mainly of

1. phospholipids embedded in a protein bilayer

2. proteins embedded in a phospholipid bilayer

3. proteins embedded in a polymer of glucose molecules

4. proteins embedded in a carbohydrate bilayer